Odontostilbe ecuadorensis Bührnheim & Malabarba, 2006

Family:  Characidae (Characins; tetras), subfamily: Cheirodontinae
Max. size:  4.58 cm SL (male/unsexed); 5.02 cm SL (female)
Environment:  pelagic; freshwater
Distribution:  South America: Ecuador and Peru on border with Ecuador. Río Napo, río Putumayo, and río Pastaza basins. The species is also recorded on lower río Napo basin in sympatry with O. fugitiva.
Diagnosis:  Characters that diagnose Odontostilbe ecuadorensis are: (1) upper gill rakers 5-6, lower 9-11, mostly 10-11 (vs. upper gill rakers 6-8, mostly 6-7, and lower 11-14, usually 12 in O. fugitiva; (2) denticulation of gill rakers more numerous in O. ecuadorensis than in O. fugitiva (in specimens larger than 32.5 mm SL), mainly on posteriormost gill raker of lower arch (5-6 denticles on basal portions of gill raker in O. ecuadorensis vs. 0-2 in O. fugitiva; (3) elongate 2nd unbranched dorsal-fin ray (vs. not elongate in O. euspilura and very short elongate in O. pulchra); (4) no hooks on unbranched pelvic-fin ray (vs. 1-2 unpaired hooks per segment on 1st unbranched pelvic-fin ray occasionally present in O. euspilura and O. pulchra); (5) 1-3 paired or unpaired hooks per segment on last unbranched anal-fin ray, and 1st to 16th anal-fin branched rays (small hooks like knots on anal-fin ray branches, usually on 10th branched fin ray and following rays) (vs. well-developed hooks on 1st to 22nd anal-fin branched rays at distal half length of fin rays in O. pulchra); and (6) usually seven large dentary teeth, with seven cusps (vs. 4 large dentary teeth with 3 large and compressed central cusps and 2, 3 lateral small cusps in O. pequira). Odontostilbe ecuadorensis differs from sympatric O. euspilura by its terminal mouth (vs. subterminal mouth).
Biology: 
IUCN Red List Status: Least Concern (LC); Date assessed: 09 October 2014 Ref. (130435)
Threat to humans:  harmless


Source and more info: www.fishbase.org. For personal, classroom, and other internal use only. Not for publication.